Which of the following carbides produces propyne on reaction with water?

C a C_{2}

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B e_{2} C

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A l_{4} C_{3}

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M g_{2} C_{3}

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Solution

The correct option is B $M g_{2} C_{3}$
$C a C_{2} + H_{2} O \to C a (O H)_{2} + H C \equiv C H ↑$
$B e_{2} C + 2 H_{2} O \to 2 B e O + C H_{4} ↑$
$A l_{4} C_{3} + 12 H_{2}) \to 4 A l (O H)_{3} + 3 C H_{4} ↑$
$M g_{2} C_{3} + 4 H_{2} O 2 + M g (O H)_{2} + H_{3} C - C \equiv C H ↑$
Hence option D is correct.

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